Mercedes W245 B170 M266 Engine Control ECU Kit A2661538879 Key Lock Automatic

Mercedes W245 B170 M266 Engine Control ECU Kit Key Lock Automatic is a precisely selected, used set designed for vehicles equipped with an automatic transmission. Thanks to the factory configuration for a specific drivetrain type and the integration of immobilizer components, this electronic engine control module provides a solid foundation for professional repair or replacement of the powertrain control system.

Specifications and technical data

• SKU: A2661538879-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2661538879
• Substitutable numbers: A2661538879, A 266 153 88 79, A0024463040, A 002 446 30 40, 5WK90957, A1695452932, A 169 545 29 32
• Gearbox type: Automatic
• Category: ECUs & Computer Modules

Purpose and function of the ECU kit

The presented engine control set is dedicated to the Mercedes B-Class W245 model in the B170 version, which ensures proper compatibility with the vehicle's electrical architecture. The kit includes the engine control unit (ECU) along with components responsible for ignition authorization, such as the key and lock, which facilitates maintaining the integrity of the vehicle's security system.

As an item in the Electronic control modules and controllers category, the set is responsible for managing engine operation, communicating with other modules in the vehicle, and coordinating with the drivetrain system. Using a complete set minimizes the risk of immobilizer matching issues and helps reduce service time.

Compatibility with automatic transmission

This ECU kit has been prepared for use with an automatic transmission, which is crucial for the proper operation of the entire powertrain. The engine controller communicates with the transmission module, transmitting information about load, rotational speed, and driving conditions, which affects the smoothness of gear shifts and the overall performance of the drivetrain.

Selecting an ECU kit compatible with the transmission type reduces the need for additional programming and lowers the risk of communication errors between modules. This solution is particularly beneficial when replacing a faulty controller in vehicles where stable cooperation between engine electronics and the automatic transmission system is essential.

Use in service and diagnostics

The engine control kit with key and lock is suitable for professional automotive electronics workshops as well as specialized Mercedes service centers. Using a ready-made set:

• facilitates the replacement of a faulty controller without the need to transfer immobilizer data,
• speeds up the diagnostic process and vehicle startup after repair,
• limits the number of potential points of incompatibility between modules.

For users looking for solutions based on salvaged parts, such a set represents a reasonable compromise between cost and functionality, allowing the engine control system to be restored to working order while maintaining the factory logic of the system.

Benefits of using an original Mercedes module

Choosing an original control module from the Mercedes brand means maintaining compliance with the vehicle's factory electrical architecture. Proper matching of harnesses, connectors, and controller software translates into stable engine operation, correct cooperation with other modules, and predictable vehicle behavior under various operating conditions.

A used ECU kit with key and lock allows for economical repair without sacrificing the manufacturer's original design. This is particularly important in the case of modern systems where the engine controller is closely linked to the security system and the vehicle's communication network.

Mercedes electronic control modules – expansion and modernization

If you are planning a comprehensive repair or modernization of the engine area in your Mercedes and need other components from the same group, such as controllers, comfort modules, or engine management units, check out the available parts in the Mercedes electronic control modules and controllers category.

More about the operation of controllers and electronic modules

To compare solutions used in other premium brands and to better understand the role of control modules in modern cars, it is worth checking out the guide on iDrive systems and controllers in BMW. Practical tips on diagnostics and the use of salvaged parts can be found in the article Driving pleasure for years – how to take care of iDrive systems and electronic modules in BMW 3 and 5 series models using salvaged parts?.